Improvement in chimneys



UNITED STATES PATENT GFFIGE.

MERCY o. HALSTED, or s1. LOUIS, MISSOURI.

IMPROVEMENT IN CHIMNEYS.

Specification forming part of Letters Patent N 0. 182,575, datedSeptember 26, 1876; application filed 7 June 20, 1876.

To all whom it may concern:

Be it known that I, MERCY CoMsTocK HAL- S'lED, of St. Louis, in thecounty of St. Louis and State of Missouri, have invented a new andIIIIPIOXBd Ohimney, of which the following is a specification:

In the accompanying drawing, Figure 1 represents a sectional sideelevation of my improved chimney; and Fig. 2, a horizontal section ofthe same on line 0 c, Fig. 1.

Similar letters of reference indicate corresponding parts.

The object of my invention is to supply a uniform heat and establish anefifective ventil-ation in houses, and buildings generally, by

' an improved chimney-flue, so that a less quantity of fuel is consumedthan in the present styles of heating appliances and the atmosphere atthe same time kept pure and healthy.

The invention consists of a chimney with spiral exterior smoke-flue andinterior heating and ventilating passages.

In the drawing, A represents the interior and B the exteriorcylinder ofmy improved heating and ventilating chimney. The smoke iseonveyed'upward from thefurnace at the cellar of the building, betweenthe inner sur-' face of the exterior cylinder and the outer surface ofthe interior cylinder, by a spiral or helical flue, U, of greater orless pitch, that extends throughout the length of the cylinders,

I so as to form a radiating smoke-flue between the same. The smoke isconducted to the top of the house or buildingthrough a suitable cowl atthe outside, the heating capacity of the same being entirely utilizedduring its passage through the winding of the smokeflue. The interiorcylinder is divided by a vertical partition-wall, D, into two passages,

smoke and the heated products of combustion may be retained in thechimney, and thus a still greater economy efl'ected in the quantity offuel used.

The same principle may be also applied to boilerflues and otherappliances in which the economic combustion of fuel is to beaccomplished.

Having thus described my invention, I claim as new and desire to secureby Letters Patent l. A chimney having exterior smoke-flue and interiorheating and ventilating passages or flues, substantially in the mannerand for the purpose set forth.

2. A chimney made of an outer and inner cylinder, and having a verticalpartition-wall in the inner cylinder, forming heating and ventilatingpassages, substantially as set forth.

MERCY O. HALSTED.

